Drill point gauge



April 3, 1951 Af G. RABUCK I 2,547,284

DRILL POINT GAUGE Filed Feb. 2o, 1946 Patented pr. 3, 195i UNITED STATES PATENT OFFICE DRILL POINT GAUGE Arthur G.- Rabu'ck,` Royalton, Pa.

Application llebruary 20, 1946, Serial No. 649,016

1` Claim.' 1

This invention relates to new and useful improvements and structural refinements in drill sharpening gauges,r more particularly, to a gauge which may be easily and conveniently applied to the drillv after the same has been sharpened, in order to determine if the cutting edges thereof have been uniformly ground to a proper angle andif the drill point is correctly centralized.

A further object of the invention is to provide a gauge which may' be universally applied to various sizes-of drills.

Another object of the invention is toprovide a gauge inwhich the adjustment for various drill sizes may be easily and accurately eiiected.

An additional object of the invention is to` provide a gauge which is of simple construction.` and which cannot easily become damaged.

With the above more important objects in View, andY such other objects as may become apparent asthis specification proceeds, the invention consists essentially of the arrangement and construction of parts asvillustrated in the accoin- Y panying drawings, in which:

Figure 1 is a side elevation of the invention;

Figure 2 is a cross sectional View taken in the plane of the line 2 2 in Figure 1;

Figure 3 is a cross sectional view taken in the plane of the line 3-3 in Figure 1;

Figure 4 is a cross sectional view taken in the plane of the line 4-4 in Figure 1;

Figure 5 is a cross sectional view taken in the plane of the line 5 5 in Figure l, and

Figure 6 is a cross sectional view taken in the plane of the line E-S in Figure 1.

Like characters of reference are used to ldesignate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, the invention consists of a straight edged blade I0, which may, if desired, be inscribed With the conventional graduated scale I I. A stop I2 is pressed onto one end of the blade IB and a gauge plate I3 is longitudinally slidable edge to edge on the blade, as will be clearly apparent from the accompanying drawings.

The gauge plate I3 is of a substantially triangular configuration and a U-shaped stirrup designated generally by the reference character I4 is secured to the plate I3 by the rivets I5. The rivets I5 extend through the side arms I6 of the stirrup, these side arms in turn, straddling the blade I0, as is best illustrated in the accompanyalong. the blade I0, as will be herein the friction of the block i9 against the blade. l@

will be relieved and the stirrup I4 together with the associated bladev I3 may be slid lon itudinally fully described.

A traveller plate 20 is slidable edge to vedge'ii the gaugeplate I 3, the plate 2I3'being provided with. a pair of spaced fingers 2|. These ngers are provided with a pair of aligned apertures 22 and 'a screw-threaded rod 23 passes freely through the apertures and parallels the traveller plate 2t, asis best illustrated in the accompanying Figure 4. A knurled adjusting nut 24 is positioned on the rod 23 between the fingers 2l, and one end of the rod is formed with a forked extremity 25 which straddles'and is pivotally connected to the gauge plate I3 by means of a rivet-like pin 25S.

A further stirrup 27 is used for retaining the traveller plate 2l! on the gauge plateV I3, the construction of the stirrup 21 being identical to that already described in connection withv theU stirrup I4.

The edges 28 and 29 of the plates I3 and 2E! re'` spectively, are complementary to the cross sectional contour of the point of a drill 33, when the latter is positioned parallel with and adjacent to the edge 3| of the blade IIl and, therefore, the included angle between the inclined edge 29 of the traveller plate 2!! and the inclined edge 28 of the gauge plate I3 is equal to the included angle between the inclined edge 28 of the gauge plate I3 and the edge 3l of the blade IS.

The gauge plate I3 is inscribed adjacent its edge 28 with a graduated scale 32 conforming to the sizes of drills. This scale is readable against a reference index 33 inscribed on the adjacent plate 2Q, as is best illustrated in the accompanying Figure l.

Having thus describedthe construction of the invention, its inethod of operation will now be presented.

When the invention is placed in operation, the drill 3i) is positioned parallel with and adjacent to the edge 3l of the blade Il), as has already been 3 set forth. The position of the plate I3 on the blade may be set in accordance with the length of the drill by adjusting the stirrup I4.

Thereupon, the stirrup 21 is loosened and by rotating the nut 24, the plate 20 will be adjusted with respect to the plate I3 to accommodate a given size of drill.

When this adjustment has been made, the plate 20 is locked in position by tightening the stirrup 21 and the accuracy of the angle to which the cutting edges of the drill have been ground and the central disposition of the drill point may be readily determined by comparing the same with the gauge surfaces 28 and 29.

While in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor changes in the details of construction, combinae tion and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

What l claim as my invention is:

A drill sharpening gauge comprising in combination, a straight edge blade inscribed with a graduated scale, a trapezoidal gauge plate slidably mounted on one edge of said blade, said gauge plate having an inclined edge and graduations adjacent the inclined edge, said inclined edge being disposed at an included obtuse angle with respect to said blade, a substantially U- shaped member carried by said gauge plate and slidably mounted on said blade, a friction block in said U-shaped member, an adjustable screw carried by said U-shaped member urging said block against one edge of said blade, a traveller plate slidably mounted on the inclined edge of said gauge plate, said traveller plate having a reference index for registering with the graduations on said gauge plate, a further U-shaped member carried by said gauge plate and slidably receiving said traveller plate, means mounted on said further U -shaped member for retaining said traveller plate in a selected adjusted position relative to said further U-shaped member and on the inclined edge of said gauge plate, a pair of spaced parallel fingers projecting laterally from one end of said traveller plate, a screw threaded rod extending through said lingers, the axis of said rod being spaced parallel to the axis of said traveller plate, a pivot pin securing one end of said rod to said gauge plate, and means threaded on said rod and disposed between said fingers for adjustment of said rod relative to said ngers, said traveller plate having an edge intersecting the inclined edge of said gauge plate and disposed at an included obtuse angle with the inclined edge of the gauge plate, the included angle between the inclined edge of said traveller plate and inclined edge of said gauge plate being equal to the included angle between the inclined edge of said gauge plate and one edge of said blade.

ARTHUR G. RABUCK.

REFERENCES CITED The following references are of record in the le of this patent: Y

UNITED STATES PATENTS 

